Paper

Kinetically-controlled template-free synthesis of hollow silica micro-/nanostructures with unusual morphologies

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Published 5 March 2014 © 2014 IOP Publishing Ltd
, , Citation An-Qi Zhang et al 2014 Nanotechnology 25 135608 DOI 10.1088/0957-4484/25/13/135608

0957-4484/25/13/135608

Abstract

We report a kinetically-controlled template-free room-temperature production of hollow silica materials with various novel morphologies, including tubes, crutches, ribbons, bundles and bells. The obtained products, which grew in a well-controlled manner, were monodispersed in shape and size. The role of ammonia, sodium citrate, polyvinylpyrrolidone, chloroauric acid and NaCl in shape control is discussed in detail. The oriented growth of these micro-/nanostructures directed by reverse micelles followed a solution–solution–solid (SSS) mechanism, similar to the classic vapor–liquid–solid mechanism. The evolution processes of silica rods, tubes, crutches, bundles and bells were recorded using transmission electron microscopy to prove the SSS mechanism.

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10.1088/0957-4484/25/13/135608